In search of vitamin D

The right dose for bone health depends on key factors.

If you're wondering how much vitamin D will keep your bones healthy, you're not alone. Supplements of no more than 400 international units (IU) of vitamin D and 1,000 milligrams (mg) of calcium per day don't do much. A recent study in the New England Journal of Medicine said high-dose vitamin D (800–2,000 IU) reduced hip fractures by 30%. "The exact dosage that's required is still very controversial," says Dr. Jill Paulson, an instructor in medicine at Harvard Medical School.

To continue reading this article, you must login.
  • Research health conditions
  • Check your symptoms
  • Prepare for a doctor's visit or test
  • Find the best treatments and procedures for you
  • Explore options for better nutrition and exercise
Learn more about the many benefits and features of joining Harvard Health Online »